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Home/ Questions/Q 3357166
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Editorial Team
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Editorial Team
Asked: May 18, 20262026-05-18T02:36:03+00:00 2026-05-18T02:36:03+00:00

I have public static readonly Dictionary<string, EventHandler> CacheHandlers = new Dictionary<string, EventHandler>(); and I

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I have

public static readonly Dictionary<string, EventHandler> CacheHandlers = new Dictionary<string, EventHandler>();

and I have duplicate keys in this dictionary:

debugger screenshot: https://i.stack.imgur.com/tuXI7.png

How does it happen?

Is it a bug in the .net framework or could it be an artifact of concurent usage?

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  1. Editorial Team
    Editorial Team
    2026-05-18T02:36:04+00:00Added an answer on May 18, 2026 at 2:36 am

    MSDN states that Dictionarys might not be thread safe.

    If you are concurrently reading from the Dictionary, then it might be safe so long as you lock the Dictionary when you add new key/value pairs.

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